A horizontal, usually underground stem that often sends out roots and shoots from its nodes. Also called rootstock.
[Greek rhizōma, mass of roots, from rhizoun, to cause to take root, from rhiza, root; see wrād- in the Appendix of Indo-European roots.]
rhi·zoma·tous (-zŏmə-təs, -zōmə-) adj.
(click for a larger image)rhizome
Solomon's seal rhizome
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.